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TM 9-4120-389-14
5-4. PURGING THE REFRIGERANT SYSTEM
Preliminary procedure: Discharge the refrigerant system. (See para. 5-3).
Supplies: Nitrogen cylinder (item 4, Appendix E)
WARNING
Nitrogen is an inert gas. However, it also presents danger as a suffocant and, therefore, must also be
discharged in a ventilated location.
CAUTION
Nitrogen cylinders are pressurized containers. The pressure in the cylinder can exceed 2000 psi. A nitrogen
pressure regulator should be used at all times when nitrogen is used for leak check or purge operations.
NOTE
The refrigeration system must be purged with dry nitrogen, Item 4, Appendix E, before any brazing is
performed on any component. A flow of dry nitrogen between I and 2 cfm (0.028-0.057) m3/minutes) should be
continued during all brazing operations to minimize internal oxidation and scaling.
a. Discharge system (See para. 5.3).
b. Connect the center hose from the charging manifold to a nitrogen regulator (Item 5, Appendix B) and
dry nitrogen tank (Item 4, Appendix E).
Change 2 5-5
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